The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Name:	us-gaap_ConversionOfStockSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Class B Common Stock conversion (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 26, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Conversion of Stock [Line Items]
Conversion of stock, additional cash issued to Class B common stock holders		$ 0	$ 0	$ 12,000	$ 0
Conversion, Class B Common Stock to Common Stock
Conversion of Stock [Line Items]
Conversion of stock, additional cash issued to Class B common stock holders	$ 12,000			$ 12,000
Conversion, Class B Common Stock to Common Stock \| Class B Common Stock
Conversion of Stock [Line Items]
Conversion of stock, number of shares converted	1,050,012
Conversion, Class B Common Stock to Common Stock \| Common Stock
Conversion of Stock [Line Items]
Conversion of stock, number of shares issued	1,050,012